Modelines/Metamodes/Screen Resolutions trouble with NVIDIA drivers 302 and up

Hello everyone. I appear to be a yet another user who can't configure his screen resolutions after the 302 version of the NVIDIA driver came out (using the 304.32 version ATM).

I've read the manuals, googled and searched through these forums, however the solutions posted here don't work for me (either that, or I'm doing something wrong - which is quite likely the case).

A little background first. I own a laptop whose native screen resolution is 1440x900. Up till version 295, I had to explicitly state some of my modelines in the monitor section of my xorg.conf, otherwise they wouldn't appear in either the xrandr list, or the nvidia-settings GUI (or anywhere else). More precisely, those were the widescreen resolutions lower than my native one (i.e. 1360x850, 1280x800, 960x600, and so on). Some of the 4:3 resolutions worked out-of-the-box (such as 1024x768), but in the end I ended up writing modelines for every resolution I needed in my xorg.conf, just to stay on the safe side.

Now that the 302 and 304 are out, none of these work anymore. I am aware that the configuration syntax was intentionally changed, I just can't seem to catch up with what I am supposed to do now.

...but the modes here are not available in the nvidia-settings GUI, nor the KDE's display options (both of which, again, just show 1440x900). What is even stranger (to me, at least), are the modes number 1 and 5 - I never used those, and switching to them via xrandr looks pretty strange (black bars on top and bottom of my screen, making it look even "wider" than the 16:10 aspect).

Any help regarding this would be much appreciated. I'm fairly sure I'm doing something wrong, but I don't really know what.

Thanks in advance!

EDIT: and yeah, sorry for the mess in this post. Now that I look at it, it seems I've had quite a bit of stuff confused. So just please ignore it the post under this one is addressing what I'm actually having trouble with ATM.

However, one thing still remains.My 4:3 screen modes are not scaled with proper aspect ratio. The way I understood it, it has something to do with the ViewPortOut command, but I can't seem to figure out the proper syntax. Could someone please help me with this? TIA

EDIT: Nevermind, solved that one, too. The commas were missing from the "Option "metamodes"" line: